The W78L52 is an 8-bit microcontroller with a supply voltage range of 1.8V to 5.5V and a DC-24MHz operating frequency. It has 256 bytes of on-chip RAM and 8K bytes of on-chip mask ROM for application programs.
The W78L52 is an 8‑bit microcontroller that offers a wide frequency and supply voltage range, compatible with the standard 80C52 series. It includes four 8‑bit bidirectional ports, an extra 4‑bit I/O port, three 16‑bit timer/counters, a full‑duplex serial port, and a watchdog timer, all supported by an eight‑source, two‑level interrupt system.
The manual covers pin configurations for DIP, PLCC, and QFP packages, detailed pin descriptions, functional blocks such as timers, clock options, power‑down and idle modes, reset behavior, and special features like the XICON register, EMI reduction, and watchdog timer control. Package dimensions and contact information for Winbond are also provided.
| Supply voltage | 1.8 V to 5.5 V |
|---|---|
| Maximum operating frequency | 24 MHz |
| On‑chip RAM | 256 bytes |
| On‑chip ROM | 8 KB mask ROM |
| Program memory address space | 64 KB |
| Data memory address space | 64 KB |
| I/O ports | Four 8‑bit ports + one 4‑bit port |
| Timer/counters | Three 16‑bit |
| Serial port | Full‑duplex |
| External interrupts | INT2, INT3 (additional) |
| Watchdog timer | Free‑running timer with prescaler |
| Package (DIP) | 40‑pin DIP (W78L52‑24) |
The W78L52 operates from 1.8 V up to 5.5 V.
It has two software‑selectable modes: idle mode and power‑down mode.
It provides four 8‑bit bidirectional ports plus an extra 4‑bit bit‑addressable port (Port 4).